ACOUSTIC HARMONIC-GENERATION FROM FATIGUE-INDUCED DISLOCATION DIPOLES

被引：172

作者：

CANTRELL, JH ^{[1
]}

YOST, WT ^{[1
]}

机构：

[1] NASA,LANGLEY RES CTR,HAMPTON,VA 23681

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1994年 / 69卷 / 02期

基金：

美国国家航空航天局;

关键词：

D O I：

10.1080/01418619408244346

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A model is presented of the interaction of an acoustic wave with dislocation dipoles and dipole-array approximations to veins and persistent slip bands (substructures) formed during metal fatigue. The model predicts the generation of a substantial acoustic second harmonic that depends on the distance between the glide planes of the dipole pair, on the dipole density, and on the particular arrangement and volume fraction of dipoles in a given substructure of the fatigued solid. Experimental evidence which strongly supports the essential features of the model is presented for fatigued aluminium alloy 2024-T4.

引用

页码：315 / 326

页数：12

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